1242121147 has 2 divisors, whose sum is σ = 1242121148. Its totient is φ = 1242121146.

The previous prime is 1242121063. The next prime is 1242121151. The reversal of 1242121147 is 7411212421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242121147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242125147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621060573 + 621060574.

It is an arithmetic number, because the mean of its divisors is an integer number (621060574).

Almost surely, 2^1242121147 is an apocalyptic number.

1242121147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242121147 is an equidigital number, since it uses as much as digits as its factorization.

1242121147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 25.

The square root of 1242121147 is about 35243.7391177497. The cubic root of 1242121147 is about 1074.9493098867.

Adding to 1242121147 its reverse (7411212421), we get a palindrome (8653333568).

The spelling of 1242121147 in words is "one billion, two hundred forty-two million, one hundred twenty-one thousand, one hundred forty-seven".